﻿using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace SXFramWork.Core
{
    /// <summary>
    /// 发送Http请求
    /// </summary>
    public class HttpHelper
    {
        /// <summary>
        /// 发起POST同步请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers">填充消息头</param>        
        /// <returns></returns>
        public static string HttpPost(string url, string postData = null, string contentType = null, int timeOut = 30, Dictionary<string, string> headers = null)
        {
            postData = postData ?? "";
            var httpclientHandler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, error) => true
            };
            using (HttpClient client = new HttpClient(httpclientHandler))
            {
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                using (HttpContent httpContent = new StringContent(postData, Encoding.UTF8))
                {
                    if (contentType != null)
                        httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);

                    HttpResponseMessage response = client.PostAsync(url, httpContent).Result;
                    return response.Content.ReadAsStringAsync().Result;
                }
            }
        }
        /// <summary>
        /// 发起POST异步请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <param name="contentType">application/xml、application/json、application/text、application/x-www-form-urlencoded</param>
        /// <param name="headers">填充消息头</param>        
        /// <returns></returns>
        public static async Task<string> HttpPostAsync(string url, string postData = null, string contentType = null, int timeOut = 30, Dictionary<string, string> headers = null)
        {
            postData = postData ?? "";
            var httpclientHandler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, error) => true
            };
            using (HttpClient client = new HttpClient(httpclientHandler))
            {
                client.Timeout = new TimeSpan(0, 0, timeOut);
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                using (HttpContent httpContent = new StringContent(postData, Encoding.UTF8))
                {
                    if (contentType != null)
                        httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);

                    HttpResponseMessage response = await client.PostAsync(url, httpContent);
                    return await response.Content.ReadAsStringAsync();
                }
            }
        }

        /// <summary>
        /// 发起GET同步请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static string HttpGet(string url, Dictionary<string, string> headers = null)
        {
            var httpclientHandler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, error) => true
            };
            using (HttpClient client = new HttpClient(httpclientHandler))
            {
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                HttpResponseMessage response = client.GetAsync(url).Result;
                return response.Content.ReadAsStringAsync().Result;
            }
        }

        /// <summary>
        /// 发起GET异步请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="headers"></param>
        /// <param name="contentType"></param>
        /// <returns></returns>
        public static async Task<string> HttpGetAsync(string url, Dictionary<string, string> headers = null)
        {
            var httpclientHandler = new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, error) => true
            };
            using (HttpClient client = new HttpClient(httpclientHandler))
            {
                if (headers != null)
                {
                    foreach (var header in headers)
                        client.DefaultRequestHeaders.Add(header.Key, header.Value);
                }
                HttpResponseMessage response = await client.GetAsync(url);
                return await response.Content.ReadAsStringAsync();
            }
        }

        public static byte[] HttpWebRequestImage(string url)
        {
            WebRequest wreq = WebRequest.Create(url);
            var wresq = (HttpWebResponse)wreq.GetResponse();
            // 接下来要放到Response里面 
            using (var stream = wresq.GetResponseStream())
            {
                List<byte> bytes = new List<byte>();
                int temp = stream.ReadByte();
                while (temp != -1)
                {
                    bytes.Add((byte)temp);
                    temp = stream.ReadByte();
                }
                wresq.Close();
                return bytes.ToArray();
            }

        }

    }
}
